Arch Linux User Repository

Or if you'd like to push your luck, you can try this patch, on the basis of https://github.com/python/cpython/blob/v3.8.20/Objects/abstract.c#L292-L316

diff --git a/qpy/QtCore/qpycore_pyqtsignal.cpp b/qpy/QtCore/qpycore_pyqtsignal.cpp
--- a/qpy/QtCore/qpycore_pyqtsignal.cpp 2025-04-25 17:45:13.313875991 +0200
+++ b/qpy/QtCore/qpycore_pyqtsignal.cpp 2025-04-25 17:46:22.604618384 +0200
@@ -658,7 +658,11 @@ PyObject *qpycore_call_signal_overload(q
     if (!func)
         return 0;

+#if PY_MAJOR_VERSION >= 3
+    PyObject *result = PyObject_Call(func, args, kw);
+#else
     PyObject *result = PyCFunction_Call(func, args, kw);
+#endif

     Py_DECREF(func);

diff --git a/qpy/QtCore/qpycore_qtlib.cpp b/qpy/QtCore/qpycore_qtlib.cpp
--- a/qpy/QtCore/qpycore_qtlib.cpp  2025-04-25 17:45:13.314191046 +0200
+++ b/qpy/QtCore/qpycore_qtlib.cpp  2025-04-25 17:45:40.204713167 +0200
@@ -127,7 +127,11 @@ PyObject *qtlib_invoke_slot(const sipSlo

     for (;;)
     {
+#if PY_MAJOR_VERSION >= 3
+        PyObject *resobj = PyObject_CallObject(sfunc, sa);
+#else
         PyObject *resobj = PyEval_CallObject(sfunc, sa);
+#endif

         if (resobj)
         {
diff --git a/qpy/QtCore/qpycore_qstring.cpp b/qpy/QtCore/qpycore_qstring.cpp
--- a/qpy/QtCore/qpycore_qstring.cpp     2018-08-31 09:37:06.000000000 +0200
+++ b/qpy/QtCore/qpycore_qstring.cpp 2025-04-25 18:14:38.746056092 +0200
@@ -246,6 +246,9 @@ const char *qpycore_encode(PyObject **s,
     PyObject *obj = *s;
     const char *es = 0;
     SIP_SSIZE_T sz;
+#if PY_MAJOR_VERSION >= 3
+    Py_buffer view;
+#endif

     if (PyUnicode_Check(obj))
     {
@@ -291,17 +294,22 @@ const char *qpycore_encode(PyObject **s,
         es = PyBytes_AS_STRING(obj);
         Py_INCREF(obj);
     }
+    else if (PyObject_GetBuffer(obj, &view, PyBUF_SIMPLE) >= 0)
 #else
     else if (PyString_Check(obj))
     {
         es = PyString_AS_STRING(obj);
         Py_INCREF(obj);
     }
-#endif
     else if (PyObject_AsCharBuffer(obj, &es, &sz) >= 0)
+#endif
     {
         Py_INCREF(obj);
     }
+#if PY_MAJOR_VERSION >= 3
+    es = (const char*)view.buf;
+    PyBuffer_Release(&view);
+#endif

     if (es)
     {

Python 3.13 removed PyObject_AsCharBuffer. Since there really is no point in maintaining the Python 3 side, python-pyqt4 has been dropped. Only python2-pyqt4 is kept for the legacy applications. (Also dropped the phonon-qt4 optional dependency. Thanks for mentioning it, MarsSeed.)

building fails for me

../qpy/QtCore/qpycore_qstring.cpp:301:14: error: ‘PyObject_AsCharBuffer’ was not declared in this scope; did you mean ‘PyObject_CheckBuffer’?
  301 |     else if (PyObject_AsCharBuffer(obj, &es, &sz) >= 0)
      |              ^~~~~~~~~~~~~~~~~~~~~
      |              PyObject_CheckBuffer
make[1]: *** [Makefile:1320: qpycore_qstring.o] Error 1
make[1]: Leaving directory '/home/jonas/.cache/yay/pyqt4/src/PyQt4_gpl_x11-4.12.3/QtCore'
make: *** [Makefile:60: sub-QtCore-make_default-ordered] Error 2
==> ERROR: A failure occurred in build().
    Aborting...

Package builds fine for me with Python 3.12. IIRC it did indeed not build around the time you posted, but now it does. An update to some dependency must have fixed it.

Also I think phonon-qt4 is safe to drop from make/opt depends, as none of the existing applications that use python2-pyqt4 seem to require multimedia playback capability via phonon.

The build of python-pyqt4 is broken on Python 3.12.

It is likely that they can be fixed, but actually you can safely drop the Python3 package of pyqt4. As all its reverse dependencies are already broken, EOL, unmaintained, and pending deletion.

Urgh, thanks for pointing that out. No clue how any of this works or how to fix that, I'm not a Python dev. Tbh, I'm only interested in the Python 2 part of this package, so... patches welcome I guess?

It is building now, thanks. I guess you have seen the warning

==> Starting build()...
/build/pyqt4/src/PyQt4_gpl_x11-4.12.3/configure-ng.py:22: DeprecationWarning: The distutils package is deprecated and slated for removal in Python 3.12. Use setuptools or check PEP 632 for potential alternatives
  from distutils import sysconfig
/build/pyqt4/src/PyQt4_gpl_x11-4.12.3/configure-ng.py:22: DeprecationWarning: The distutils.sysconfig module is deprecated, use sysconfig instead
  from distutils import sysconfig

@FabioLolix: Should be fixed.

Fails to build, 1 error, all chain of pkgbuilds builded with devtools

../qpy/QtCore/qpycore_classinfo.cpp: In function ‘PyObject* qpycore_ClassInfo(const char*, const char*)’:
../qpy/QtCore/qpycore_classinfo.cpp:39:22: error: invalid use of incomplete type ‘PyFrameObject’ {aka ‘struct _frame’}
   39 |         frame = frame->f_back;
      |                      ^~
In file included from /usr/include/python3.11/Python.h:42,